Linux off firewall, open port

Centos/redhat System:

Turn on the firewall

#systemctl Start Firewalld.service

Stop firewall

#systemctl Stop Firewalld.service

Disable firewall boot

#systemctl Disable Firewalld.service

View default firewall status (show not running after turn off, show running on when turned on)

#firewall-cmd--state

To configure iptables, you first need to install the Iptables service

#yum Install Iptables-services

Edit the firewall configuration file

#vim/etc/sysconfig/iptables

Add the following lines, 22 is the default

-A input-p tcp-m state--state new-m TCP--dport 80-jaccept

-A input-p tcp-m state--state new-m TCP--dport 8080-j ACCEPT

-A input-p tcp-m state--state new-m TCP--dport 443-j ACCEPT

Port 22 is for SSH access, the 80,8080 port is accessed by the HTTP service, later with HTTPS, you also need to open 443 port access rights.

Save, restart Iptables service

Finally reboot the firewall to make the configuration effective

#systemctl Restart Iptables.service

Setting up a firewall boot

#systemctl Enable Iptables.service

After reboot firewall is turned on again, so we want to set disable firewall boot from boot

Prohibit firewall boot from booting

Stop firewall

#systemctl Stop Firewalld.service

Disable firewall boot

#systemctl Disable Firewalld.service

Linux off firewall, open port